CN100407862C - Method for realizing intercell soft switching in OFDM system - Google Patents
Method for realizing intercell soft switching in OFDM system Download PDFInfo
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- CN100407862C CN100407862C CN2004101013359A CN200410101335A CN100407862C CN 100407862 C CN100407862 C CN 100407862C CN 2004101013359 A CN2004101013359 A CN 2004101013359A CN 200410101335 A CN200410101335 A CN 200410101335A CN 100407862 C CN100407862 C CN 100407862C
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Abstract
The present invention provides a method for realizing cross-cell soft switching in an OFDM system. The key point is that a mobile station measures the signal quality of a current cell and an adjacent cell in real time and reports measurement information. A network side confirms that the mobile station needs to switch cross cells according to the information reported by the mobile station, and notifies the mobile station to enter a cross-cell switching mode after determining the adjacent switching cell. The mobile station simultaneously establishes link connection with both the current cell and the adjacent switching cell, and receives and merges the signals of the current cell and the adjacent switching cell. The mobile station releases link connection with cells not capable of satisfying communication requirements and recovers a normal communication mode. Thus, the present invention has no any requirements to the same and different frequency of the adjacent cell; that is to say, the present invention can realize the cross-cell soft switching of the OFDM system to ensure service continuance no matter the adjacent cell has the same frequency or different frequency. Consequently, the present invention can support real-time and flow media class services.
Description
Technical field
The present invention relates to the mobile communication technology field, be meant the method that realizes striding the sub-district soft handover in a kind of ofdm system especially.
Background technology
OFDM (OFDM, Orthogonal Frequency Division Multiplexing) is to utilize parallel transmission to improve a kind of mobile communication technology of communication data transmission rate.Information flow is mapped on the different frequency channels and transmits in the system that adopts the OFDM technology.In prior OFDM system,, need when move to another sub-district, a sub-district have following several method to realize striding the sub-district usually and switch if travelling carriage is in cell edge:
Method one: travelling carriage (UE) is not striden in communication process that the sub-district is switched and is measured, when travelling carriage and current sub-district lose be connected after, begin to measure the signal of other neighbor cells, and then insert signal neighbor cell preferably.
Above-mentioned employing be the method for direct-cut operation, it is more weak that this method is used for the such mobility support of similar wireless lan (wlan), is fine in the system based on transfer of data simultaneously.But, be applied among the following 3G and 4G mobile communication system if wish ofdm system, particularly being applied to is that professional interruption can greatly influence quality of service in real time business and the streaming media service.Have again, said method do not consider to set up simultaneously with two or more sub-districts between be connected, lost macro diversity.In addition, because the existence of long period interruption, this interruption gently then causes information dropout, causes high-rise the re-transmission, waste channel width; Heavy then cause losing being connected of travelling carriage and original sub-district, and system produced disturb.
Method two: in communication process, measure the signal quality of neighbor cell by travelling carriage,, stop and being connected of current area, afterwards, rebulid and new being connected of sub-district by network side (or travelling carriage) decision if the signal quality of neighbor cell is higher than current area.
This changing method remains a kind of method of direct-cut operation, but with preceding a kind of method ratio because measuring process has been put in the communication process, so time of service interruption is shorter.But and preceding a kind of method is similar, owing to can not set up simultaneously and being connected of two sub-districts, lost macro diversity, and still there is interruption in this method, and same, this interruption gently then causes information dropout, causes high-rise the re-transmission, waste channel width; Heavy then cause losing being connected of travelling carriage and original sub-district, and system produced disturb.
Method three: in travelling carriage, increase in addition one or more transceivers, utilize these transceivers to set up simultaneously and being connected of an above sub-district, the information that receives is merged the realization soft handover.
This method can guarantee the professional integrality and the continuity of system, but its defective is cost and the power loss that has increased travelling carriage.
Method four: when adjacent a plurality of sub-districts are in same frequency; if travelling carriage is in the edge of a plurality of sub-districts; and the signal of neighbor cell arrives the time basic synchronization of travelling carriage; time difference is less than the protection time slot of OFDM; then directly carry out the soft merging of OFDM symbol, use this method and obtained the gain of grand diversity and kept professional continuity.
The defective of said method need to be the sub-district that participation is switched all to adopt same frequency, does not support the soft handover of alien frequencies; The signal that requires each sub-district to arrive travelling carriage simultaneously must require the minizone will keep synchronous preferably synchronously like this, and network side must have well planning synchronously simultaneously, has increased the network side cost.
Summary of the invention
In view of this, the object of the present invention is to provide the method that realizes striding the sub-district soft handover in the ofdm system, no matter neighbor cell is that travelling carriage can both carry out soft handover with frequency or alien frequencies, and can guarantee professional continuity.
For achieving the above object, technical scheme of the present invention is achieved in that
Realize striding the method for sub-district soft handover in a kind of ofdm system, this method may further comprise the steps: a, travelling carriage are measured the signal quality of current area and neighbor cell in real time, and report measurement information;
B, network side confirm that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, the orthogonal frequency division multiplex OFDM symbol of sub-district, described travelling carriage place is divided into the OFDM symbol class, with the subcarrier at least one OFDM symbol class wherein as the idle sub-carrier of not transmitting described travelling carriage current area business datum; And after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode;
C, travelling carriage utilize the described adjacent switching cell of described idle sub-carrier and step b to set up link simultaneously to be connected, to receive the signal of sub-district, current place and adjacent switching cell simultaneously, and merge;
D, travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected the recovery normal communication mode.
Preferably, the described metrical information of step a comprises: the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, the time difference that the orthogonal frequency division multiplex OFDM symbol of travelling carriage sub-district, current place and each neighbor cell arrives; The described network side of step b is confirmed this travelling carriage according to the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, and whether needs are striden the sub-district switching.
Preferably, the described network side notice of step b travelling carriage enters the process of striding the sub-district switch mode and is: network side is divided into more than one OFDM symbol class respectively with the OFDM symbol of sub-district, the current place of this travelling carriage and the adjacent switching cell of selecting, the time difference that the sub-district, current place that reports according to travelling carriage and the OFDM symbol of adjacent switching cell arrive, the OFDM symbol class of determining and notifying travelling carriage current area and adjacent switching cell to switch usefulness, and the idle sub-carrier in the OFDM symbol class of travelling carriage current area and adjacent switching cell switching usefulness;
Further comprise between step b and the step c: travelling carriage will with idle sub-carrier in being transformed in the current area OFDM symbol class that switches usefulness being connected of current area on;
The described travelling carriage of step c utilizes the described adjacent switching cell of described idle sub-carrier and step b to set up link-attached process simultaneously: travelling carriage utilizes in the described adjacent switching cell idle sub-carrier in the OFDM symbol class that switches usefulness to set up link with adjacent switching cell to be connected.
Preferably, the OFDM symbol class of described current area and adjacent switching cell switching usefulness is: the nonoverlapping OFDM symbol class of time that arrives travelling carriage in current area and the adjacent switching cell.
Preferably, this method further comprises: moving table measuring arrives time difference of nonoverlapping OFDM symbol class of time of travelling carriage less than predefined time difference during threshold value in current area and adjacent switching cell, informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness; The time difference that the network side joint reports according to travelling carriage and the subcarrier information of the current use of travelling carriage redefine the idle sub-carrier in the OFDM symbol class that current area and adjacent switching cell switch usefulness, re-execute subsequent step then.
Preferably, described definite current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the method for the idle sub-carrier in the OFDM symbol class of this switching usefulness may further comprise the steps:
01) checks the subcarrier that whether has enough free time in every class OFDM symbol in current area and the adjacent switching cell successively, be used for transmitting the data that this current to be switched travelling carriage transmits on current area and adjacent switching cell residue OFDM class, if, then directly obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 02);
02) metrical information that reports according to other travelling carriages except that this current to be switched travelling carriage in current area and the adjacent switching cell, judge whether exist other need stride the travelling carriage that switch the sub-district in current area and the adjacent switching cell, if, then execution in step 03), otherwise execution in step 04);
03) according to current to be switched travelling carriage and step 02) described other need enter the number of the shared subcarrier of the travelling carriage of switching state, in current area and adjacent switching cell, can judge successively in every class OFDM symbol with step 02) the described subcarrier that other need enter residue OFDM class in the shared sub-district of the shared subcarrier of the travelling carriage of switching state and current to be switched travelling carriage exchanges, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in the sub-district, if can, then carrying out subcarrier exchanges, obtain the idle sub-carrier in such OFDM symbol, process ends, otherwise execution in step 04);
04) according to current to be switched travelling carriage and the needs number that enters the shared subcarrier of the travelling carriage of switching state not, in current area and adjacent switching cell, judge successively in every class OFDM symbol can the travelling carriage that does not need to enter switching state is shared subcarrier and the shared subcarrier of current to be switched travelling carriage exchange, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then carrying out subcarrier diverts, obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 05);
05) checks and calculates the number of the shared subcarrier of the above-mentioned travelling carriage that can exchange and divert, reduce the data rate of these travelling carriages, already present idle sub-carrier in the subcarrier that can exchange and divert in a certain OFDM symbol class and this OFDM symbol class is distributed to current to be switched travelling carriage, process ends.
Preferably, this method further comprises: network side writes down in acquired every class OFDM symbol and to distribute the remaining idle sub-carrier in back, to reduce the search operation in other travelling carriage switching flows next time.
Preferably, the described release of steps d is connected with link between the sub-district that can not satisfy communicating requirement, and the process of recovering normal communication mode is:
By network side according to the reporting information of travelling carriage indication travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected, perhaps by travelling carriage according to self detected information discharge with the sub-district that can not satisfy communicating requirement between link be connected and informing network side;
Network side detects that travelling carriage is current to have only a link, and this travelling carriage is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
Preferably, described adjacent switching cell is one or more neighbor cells.
Realize striding the method for sub-district soft handover in a kind of ofdm system, network side is divided into the OFDM symbol class with the orthogonal frequency division multiplex OFDM symbol of sub-district, described travelling carriage place, with the subcarrier at least one OFDM symbol class wherein as the idle sub-carrier of not transmitting described travelling carriage current area business datum; This method may further comprise the steps:
A, travelling carriage utilize described idle sub-carrier to measure the signal quality of current area and neighbor cell in real time, and report measurement information;
B, network side confirm that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, and after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode;
C, travelling carriage utilize the described adjacent switching cell of described idle sub-carrier and step b to set up link to be connected, to receive the signal of sub-district, current place and adjacent switching cell simultaneously, and merge;
D, travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected the recovery normal communication mode.
Preferably, the described metrical information of step a comprises: the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, the time difference that the orthogonal frequency division multiplex OFDM symbol of travelling carriage sub-district, current place and each neighbor cell arrives;
The described network side of step b is confirmed this travelling carriage according to the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, and whether needs are striden the sub-district switching.
Preferably, the described network side notice of step b travelling carriage enters the process of striding the sub-district switch mode and is: the OFDM symbol of the adjacent switching cell that network side will be selected is divided into more than one OFDM symbol class respectively, the time difference that the sub-district, current place that reports according to travelling carriage and the OFDM symbol of adjacent switching cell arrive, the OFDM symbol class of determining and notifying travelling carriage current area and adjacent switching cell to switch usefulness, and the idle sub-carrier in the OFDM symbol class of travelling carriage current area and adjacent switching cell switching usefulness;
Further comprise between step b and the step c: when travelling carriage keeps striding cell measurement and the connection mode of current area;
The described travelling carriage of step c utilizes described idle sub-carrier and the described adjacent switching cell of step b to set up link-attached process: travelling carriage utilizes the idle sub-carrier in the OFDM symbol class that switches usefulness in the described adjacent switching cell, sets up link with adjacent switching cell and is connected.
Preferably, the OFDM symbol class of described current area and adjacent switching cell switching usefulness is: the nonoverlapping OFDM symbol class of time that arrives travelling carriage in current area and the adjacent switching cell.
Preferably, this method further comprises: moving table measuring arrives time difference of nonoverlapping OFDM symbol class of time of travelling carriage less than predefined time difference during threshold value in current area and adjacent switching cell, informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness; The time difference that the network side joint reports according to travelling carriage and the subcarrier information of the current use of travelling carriage redefine the idle sub-carrier in the OFDM symbol class that current area and adjacent switching cell switch usefulness, re-execute subsequent step then.
Preferably, described definite current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the method for the idle sub-carrier in the OFDM symbol class of this switching usefulness may further comprise the steps:
01) checks the subcarrier that whether has enough free time in every class OFDM symbol in current area and the adjacent switching cell successively, be used for transmitting the data that this current to be switched travelling carriage transmits on current area and adjacent switching cell residue OFDM class, if, then directly obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 02);
02) metrical information that reports according to other travelling carriages except that this current to be switched travelling carriage in current area and the adjacent switching cell, judge whether exist other need stride the travelling carriage that switch the sub-district in current area and the adjacent switching cell, if, then execution in step 03), otherwise execution in step 04);
03) according to current to be switched travelling carriage and step 02) described other need enter the number of the shared subcarrier of the travelling carriage of switching state, in current area and adjacent switching cell, can judge successively in every class OFDM symbol with step 02) the described subcarrier that other need enter residue OFDM class in the shared sub-district of the shared subcarrier of the travelling carriage of switching state and current to be switched travelling carriage exchanges, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in the sub-district, if can, then carrying out subcarrier exchanges, obtain the idle sub-carrier in such OFDM symbol, process ends, otherwise execution in step 04);
04) according to current to be switched travelling carriage and the needs number that enters the shared subcarrier of the travelling carriage of switching state not, in current area and adjacent switching cell, judge successively in every class OFDM symbol can the travelling carriage that does not need to enter switching state is shared subcarrier and the shared subcarrier of current to be switched travelling carriage exchange, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then carrying out subcarrier diverts, obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 05);
05) checks and calculates the number of the shared subcarrier of the above-mentioned travelling carriage that can exchange and divert, reduce the data rate of these travelling carriages, already present idle sub-carrier in the subcarrier that can exchange and divert in a certain OFDM symbol class and this OFDM symbol class is distributed to current to be switched travelling carriage, process ends.
Preferably, this method further comprises: network side writes down in acquired every class OFDM symbol and to distribute the remaining idle sub-carrier in back, to reduce the search operation in other travelling carriage switching flows next time.
Preferably, the described release of steps d is connected with link between the sub-district that can not satisfy communicating requirement, and the process of recovering normal communication mode is:
By network side according to the reporting information of travelling carriage indication travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected, perhaps by travelling carriage according to self detected information discharge with the sub-district that can not satisfy communicating requirement between link be connected and informing network side;
Network side detects that travelling carriage is current to have only a link, and this travelling carriage is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
Preferably, described adjacent switching cell is one or more neighbor cells.
Use the present invention, travelling carriage is measured the signal quality of current area and neighbor cell in real time, and report measurement information; Network side confirms that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, and after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode; Travelling carriage is set up link simultaneously with current area and adjacent switching cell and is connected, and receives the signal of sub-district, current place and described adjacent switching cell, and merges; Travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected the recovery normal communication mode.Like this, the same alien frequencies of neighbor cell is had no requirement, that is to say, no matter neighbor cell is with frequently or alien frequencies, and that all can realize ofdm system strides the sub-district soft handover, has guaranteed professional continuity, thereby can support in real time and Streaming Media class business.
Simultaneously, use the present invention, because travelling carriage can be set up Radio Link simultaneously with a plurality of sub-districts, thereby obtained macro diversity, and the signaling consumption of system has only increased the switch mode this point that designated user uses, and therefore, has reduced the signaling consumption that is used for the minizone switching with respect to prior art, promptly reduced power loss, and do not needed to increase cost for travelling carriage and network side.
In addition,, prepare, help follow-up minizone handover operation for later switching because network side has write down remaining idle sub-carrier among every class OFDM.
Description of drawings
Figure 1 shows that distribution schematic diagram to user data before and after the OFDM classification of sign;
Figure 2 shows that the realization of using the embodiment of the invention one strides the schematic flow sheet of sub-district soft handover;
Figure 3 shows that the schematic diagram that arrives nonoverlapping OFDM symbol class of time of travelling carriage in adjacent switching cell and the current area;
Figure 4 shows that the realization of using the embodiment of the invention two strides the schematic flow sheet of sub-district soft handover;
Figure 5 shows that the schematic flow sheet that obtains idle sub-carrier.
Embodiment
Below in conjunction with accompanying drawing the present invention is done detailed description further.
Thinking of the present invention is: travelling carriage is measured the signal quality of current area and neighbor cell in real time, and report measurement information; Network side confirms that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, and after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode; Travelling carriage is set up link with current area simultaneously with selected adjacent switching cell and is connected, and receives the signal of sub-district, current place and described adjacent switching cell simultaneously, and merges; Travelling carriage release can not be satisfied the link of conversing between the sub-district that requires with signal quality and be connected, and recovers normal communication mode.
Can realize striding the sub-district soft handover in order to make travelling carriage, OFDM symbol in travelling carriage sub-district, current place and the adjacent switching cell is classified respectively, certain pending business datum of striding in the sub-district, the current place of travelling carriage of switching the sub-district moved on in the current area transmit in the subcarrier of appointment in a certain OFDM symbol class, this pending sub-district of striding of removing in the current area is switched business datum of other travelling carriages of travelling carriage and moved in the designate sub in other OFDM symbol classes in the current area, like this, stride for the travelling carriage that switches the sub-district for pending, subcarrier in other OFDM symbol classes of the business datum of other travelling carriages in the transmission current area is exactly an idle sub-carrier, the pending travelling carriage that switches the sub-district of striding utilizes this idle sub-carrier to set up link with adjacent switching cell to be connected in the current area, receive the data of current area and adjacent switching cell simultaneously, realize striding the sub-district soft handover.
At first the OFDM classification of sign is simply introduced below.
Shown in Figure 1 the OFDM symbol is classified before and after the distribution schematic diagram of user data.Present embodiment is that example describes with 3 system OFDM symbols.Among the figure, P represents pilot sub-carrier, D1, D2 and D3 represent the business datum of travelling carriage 1, travelling carriage 2 and travelling carriage 3 respectively, on time shaft t, it is one group with three OFDM symbols, in the normal state, the distribution situation of the business datum on each OFDM symbol is the same, and the pilot distribution situation also is the same, as the first half among Fig. 1.
Stride the sub-district soft handover for what can realize travelling carriage, allow travelling carriage obtain enough idle sub-carrier, setting up link with neighbor cell is connected, the data that merge reception of neighboring cell, referring to the latter half among Fig. 1, OFDM symbol among Fig. 1 being divided three classes according to time slot, being respectively TS1, TS2 and TS3, is to repeat by TS1～TS3 cycle then.
Travelling carriage 1 current business datum is concentrated on the TS1, and promptly travelling carriage 1 data subcarrier that occupies three OFDM symbols simultaneously comes service data transmission; For travelling carriage 1, TS2 and TS3 are the idle sub-carrier of this travelling carriage 1 like this, and travelling carriage 1 can utilize TS2 to set up link with TS3 with adjacent switching cell to be connected like this.
Travelling carriage 2 current business datums are concentrated on the TS2, and promptly travelling carriage 2 data subcarrier that occupies three OFDM symbols simultaneously comes service data transmission, so travelling carriage 2 can utilize TS1 to set up link with TS3 with adjacent switching cell to be connected.
Travelling carriage 3 current business datums are concentrated on the TS3, and promptly travelling carriage 3 data subcarrier that occupies three OFDM symbols simultaneously comes service data transmission, so travelling carriage 3 can utilize TS1 to set up link with TS2 with adjacent switching cell to be connected.
If supposing travelling carriage 1 among the figure is that pending in the current area striden the travelling carriage that switch the sub-district, and the data of this travelling carriage will move to TS1 promptly the row of first among the figure go up transmission, then TS2 and TS3 are called remaining OFDM symbol class, referring to the latter half among Fig. 1; Back two row in first row are called current to be switched travelling carriage and remain the data of transmitting on the OFDM class in current area, referring to the first half among Fig. 1.
The distribution situation of pilot sub-carrier all is constant to each OFDM symbol.
Certainly, the OFDM symbol is carried out The classification basis not to be limited to therewith, can adopt other mode classifications according to the configuration of system or user's demand, as long as the business that can guarantee is not interrupted, and to be switched travelling carriage can obtain to set up between idle sub-carrier and adjacent switching cell link and is connected and gets final product.
Figure 2 shows that the realization of using the embodiment of the invention one strides the schematic flow sheet of sub-district soft handover.In the present embodiment, travelling carriage is used existing method in common and is striden cell measurement.
Step 201～step 202, travelling carriage is striden cell measurement, and report measurement information.This metrical information comprises the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, and the OFDM symbol of sub-district, current place and each neighbor cell arrives the time difference τ of travelling carriage.
Step 203, pilot signal strength that network side reports according to travelling carriage and time difference τ confirm that these travelling carriage needs stride after the sub-district switches, the good neighbor cell that promptly can satisfy communicating requirement is adjacent switching cell to determine signal quality, and this adjacent switching cell is one or more neighbor cells; OFDM symbol with sub-district, the current place of this travelling carriage and the adjacent switching cell of selecting is divided into more than one OFDM symbol class according to time slot then, and the time difference τ that reports according to travelling carriage, determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the idle sub-carrier in the OFDM symbol class of this switching usefulness, nonoverlapping OFDM symbol class of time of arrival travelling carriage in promptly adjacent switching cell and the current area.Wherein, the nonoverlapping OFDM symbol class of time that arrives travelling carriage in so-called adjacent switching cell and the current area is referring to Fig. 3, and the method for obtaining idle sub-carrier is referring to Fig. 5.
Figure 3 shows that the schematic diagram that arrives nonoverlapping OFDM symbol class of time of travelling carriage in adjacent switching cell and the current area.In the present embodiment, suppose that travelling carriage set up link with current area simultaneously with an adjacent switching cell and be connected, be the travelling carriage while to have set up link to be connected with two sub-districts, and the OFDM symbol in current area and the neighbor cell all is divided three classes according to time slot, be TS1, TS2 and TS3, and the cycle repeat.Transport service information among the TS1 of travelling carriage in current area, like this TS2 and TS3 in the current area for this travelling carriage, be idle OFDM symbol class.
Referring to the first half among Fig. 3, OFDM symbol class in this adjacent switching cell arrives travelling carriage with respect to the current area delay τ time, like this, the time that the time of TS1 in this adjacent switching cell and TS3 arrival travelling carriage and the TS1 in the current area arrive travelling carriage, all life period was overlapping, have only the time of the TS2 arrival travelling carriage in this adjacent switching cell and the time of the arrival of the TS1 in current area travelling carriage not to have the overlapping of the time of advent, therefore, the TS2 in TS1 in the current area and the adjacent switching cell is for arriving nonoverlapping OFDM symbol class of time of travelling carriage.
Referring to the latter half among Fig. 3, if change along with location of mobile station, OFDM symbol class in this adjacent switching cell shifts to an earlier date the τ time with respect to current area and arrives travelling carriage, like this, the time that the time of TS1 in this adjacent switching cell and TS2 arrival travelling carriage and the TS1 in the current area arrive travelling carriage, all life period was overlapping, have only the time of the TS3 arrival travelling carriage in this adjacent switching cell and the time of the arrival of the TS1 in current area travelling carriage not to have the overlapping of the time of advent, therefore, TS1 in current area this moment and the TS3 in the adjacent switching cell are for arriving nonoverlapping OFDM symbol class of time of travelling carriage.
Step 204, the notice travelling carriage enters strides the sub-district switch mode, just notifies the nonoverlapping OFDM symbol class of time that arrives travelling carriage in adjacent switching cell of travelling carriage and the current area promptly to switch the OFDM symbol class of usefulness.
Step 205, travelling carriage will with idle sub-carrier in transferring in the current area OFDM symbol class that switches usefulness being connected of current area on, then, utilize the idle sub-carrier in the OFDM symbol class that switches usefulness in the adjacent switching cell, setting up link with adjacent switching cell is connected, simultaneously according to the information that receives, utilize the OFDM symbol class that switches usefulness to receive the signal of sub-district, current place and adjacent switching cell, because travelling carriage is just the same from the information that different sub-districts receive, therefore the information that receives is merged, thereby obtained macro diversity; When merging reception, because travelling carriage is at the time difference of the OFDM symbol arrival of constantly measuring sub-district, current place and each neighbor cell and the pilot signal strength of sub-district, current place and neighbor cell, when measured time difference τ less than predefined time difference during threshold value, think that then there is overlapping phenomenon in the OFDM symbol class of current definite switching usefulness, execution in step 206, when the intensity of the pilot signal that measures a certain sub-district during less than a predefined pilot signal strength threshold value, think that this sub-district can not guarantee communication quality, then execution in step 207.
Above-mentioned predefined time difference threshold value is to set according to the performance requirement of system itself, and above-mentioned predefined pilot signal strength threshold value is to set according to the requirement of communication quality.
Step 206, the travelling carriage informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness, network side receives the time difference τ that reports according to travelling carriage that re-executes after this information in the step 203 and the subcarrier information of the current use of travelling carriage, redefine the idle sub-carrier in the OFDM symbol class that current area and adjacent switching cell switch usefulness, continue execution in step 204 then.
Step 207, travelling carriage discharge with the low sub-district that promptly can not satisfy communicating requirement of signal quality between link be connected, according to system configuration, this releasing operation can be determined by network side, can determine that also no matter by which side decision, it all will notify the other side by travelling carriage; Network side detects that travelling carriage is current to have only a link, and is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
So far, travelling carriage has realized striding the sub-district soft handover in ofdm system.
Figure 4 shows that the realization of using the embodiment of the invention two strides the schematic flow sheet of sub-district soft handover.In the present embodiment, the travelling carriage utilization is striden cell measurement to the method for OFDM classification of sign.The specific implementation process of this method has been " striding the method for cell measurement in the ofdm system " in the denomination of invention that the applicant proposes, application number is open in the Chinese patent application of " 200410079351.2 ", only describe the travelling carriage utilization in the present embodiment method of OFDM classification of sign is striden the thinking of cell measurement, the detail content is not described in detail.
Step 401, travelling carriage at first is divided into OFDM symbol class more than the class with the OFDM symbol in the current area according to time slot, pending business datum of striding the travelling carriage that switches the sub-district in the current area is moved on in the subcarrier of appointment in a certain OFDM symbol class and transmit, allow the business datum of other travelling carriages in other OFDM symbol classes transmission current area; Current pending other OFDM symbol classes of striding the business datum of other travelling carriages in the travelling carriage utilization transmission current area of switching the sub-district, promptly Kong Xian data subcarrier is striden cell measurement.
Step 402, the travelling carriage report measurement information.At least the pilot signal strength that comprises travelling carriage sub-district, current place and neighbor cell thereof in this metrical information, the OFDM symbol of sub-district, current place and neighbor cell arrives the time difference τ of travelling carriage.
Step 403, network side confirms that according to the report pilot signal strength and the time difference τ of travelling carriage these travelling carriage needs stride after the sub-district switches, determine that the high neighbor cell that promptly can satisfy communicating requirement of signal quality is adjacent switching cell, this adjacent switching cell is one or more neighbor cells.In the present embodiment, because the travelling carriage utilization is striden cell measurement to the method for OFDM classification of sign, so travelling carriage has obtained the idle sub-carrier in the sub-district, current place.At this moment, the OFDM symbol of the adjacent switching cell that network side only need will be selected is divided into more than one OFDM symbol class according to time slot, and the time difference τ that reports according to travelling carriage, determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the idle sub-carrier in the OFDM symbol class of this switching usefulness, nonoverlapping OFDM symbol class of time of arrival travelling carriage in promptly adjacent switching cell and the current area.Wherein, the nonoverlapping OFDM symbol class of time that arrives travelling carriage in so-called adjacent switching cell and the current area is referring to Fig. 3, and the described method of idle sub-carrier of obtaining is referring to Fig. 5.
Step 404, the notice travelling carriage enters strides the sub-district switch mode, just notifies the nonoverlapping OFDM symbol class of time that arrives travelling carriage in adjacent switching cell of travelling carriage and the current area promptly to switch the OFDM symbol class of usefulness.
Step 405, when travelling carriage keeps striding cell measurement and the connection mode of current area, then, utilize the idle sub-carrier in the OFDM symbol class that switches usefulness in the adjacent switching cell, setting up link with adjacent switching cell is connected, simultaneously according to the information that receives, utilize the OFDM symbol class that switches usefulness to receive the signal of sub-district, current place and adjacent switching cell, because travelling carriage is just the same from the information that different sub-districts receive, therefore the information that receives is merged, thereby obtained macro diversity; When merging reception, because travelling carriage is constantly measured the time difference τ of OFDM symbol arrival of sub-district, current place and each neighbor cell and the pilot signal strength of sub-district, current place and neighbor cell, when the measured time difference less than predefined time difference during threshold value, think that then there is overlapping phenomenon in the OFDM symbol class of current definite switching usefulness, execution in step 406, when the intensity of the pilot signal that measures a certain sub-district during less than a predefined pilot signal strength threshold value, think that this sub-district can not guarantee communication quality, then execution in step 407.
Above-mentioned predefined time difference threshold value is to set according to the performance requirement of system itself, and above-mentioned predefined pilot signal strength threshold value is to set according to the requirement of communication quality.
Step 406, the travelling carriage informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness, network side receives the time difference τ that reports according to travelling carriage that re-executes after this information in the step 403 and the subcarrier information of the current use of travelling carriage, determine that current area and adjacent switching cell switch the idle sub-carrier in the OFDM symbol class of usefulness, continue execution in step 404 then.
Step 407, travelling carriage discharge with the low sub-district that promptly can not satisfy communicating requirement of signal quality between link be connected, according to system configuration, this releasing operation can be determined by network side, can determine that also no matter by which side decision, it all will notify the other side by travelling carriage; Network side detects that travelling carriage is current to have only a link, and is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
So far, travelling carriage has realized striding the sub-district soft handover in ofdm system.
Figure 5 shows that the schematic flow sheet that obtains idle sub-carrier.
Step 501, check the subcarrier that whether has enough free time in the every class OFDM symbol in current area and the adjacent switching cell successively, be used for transmitting the data that this current to be switched travelling carriage transmits on current area and adjacent switching cell residue OFDM class, if, then execution in step 502, otherwise execution in step 503.
Step 502 is directly obtained the idle sub-carrier in such OFDM symbol, process ends.
Step 503, the metrical information that reports according to other travelling carriages except that this current to be switched travelling carriage in current area and the adjacent switching cell, judge whether exist other need stride the travelling carriage that switch the sub-district in current area and the adjacent switching cell, if, then execution in step 504, otherwise execution in step 506;
Step 504, the number of the subcarrier that the travelling carriage that enters switching state according to current to be switched travelling carriage and described other needs of step 503 is shared, in current area and adjacent switching cell, judge successively in every class OFDM symbol and the described subcarrier that other need enter residue OFDM class in the shared sub-district of the shared subcarrier of the travelling carriage of switching state and current to be switched travelling carriage can be exchanged, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then execution in step 505, otherwise execution in step 506.
Step 505 is carried out subcarrier and is exchanged, and obtains the idle sub-carrier in such OFDM symbol, process ends.
Step 506, according to current to be switched travelling carriage and the needs number that enters the shared subcarrier of the travelling carriage of switching state not, in current area and adjacent switching cell, judge successively in every class OFDM symbol can the travelling carriage that does not need to enter switching state is shared subcarrier and the shared subcarrier of current to be switched travelling carriage exchange, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then execution in step 507, otherwise execution in step 508.
Step 507 is carried out subcarrier and is diverted, and obtains the idle sub-carrier in such OFDM symbol, process ends.
The number of the shared subcarrier of the above-mentioned travelling carriage that can exchange and divert is checked and calculated to step 508, reduces the data rate of these travelling carriages, and execution in step 509 then.
Step 509 is distributed to current to be switched travelling carriage, process ends with already present idle sub-carrier in the subcarrier that can exchange and divert in a certain OFDM symbol class and this OFDM symbol class.
Network side writes down and distributes the remaining idle sub-carrier in back in acquired every class OFDM symbol, to be used for other travelling carriages execution switching flows next time, can reduce later search operation like this, accelerates switch speed.
The above-mentioned subcarrier that specifically carries out exchanges, subcarrier is diverted, and be " striding the method for cell measurement in the ofdm system " in the denomination of invention that the applicant proposes by the process that the data rate that reduces subcarrier obtains idle sub-carrier, number of patent application is open in the Chinese invention patent application of " 200410079351.2 ", is not described in detail at this.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. realize striding the method for sub-district soft handover in the ofdm system, it is characterized in that this method may further comprise the steps:
A, travelling carriage are measured the signal quality of current area and neighbor cell in real time, and report measurement information;
B, network side confirm that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, the orthogonal frequency division multiplex OFDM symbol of sub-district, described travelling carriage place is divided into the OFDM symbol class, with the subcarrier at least one OFDM symbol class wherein as the idle sub-carrier of not transmitting described travelling carriage current area business datum; And after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode;
C, travelling carriage utilize the described adjacent switching cell of described idle sub-carrier and step b to set up link to be connected, to receive the signal of sub-district, current place and adjacent switching cell simultaneously, and merge;
D, travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected the recovery normal communication mode.
2. method according to claim 1 is characterized in that,
The described metrical information of step a comprises: the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, the time difference that the orthogonal frequency division multiplex OFDM symbol of travelling carriage sub-district, current place and each neighbor cell arrives;
The described network side of step b is confirmed this travelling carriage according to the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, and whether needs are striden the sub-district switching.
3. method according to claim 2 is characterized in that,
The described network side notice of step b travelling carriage enters the process of striding the sub-district switch mode and is: the OFDM symbol of the adjacent switching cell that network side is selected with this travelling carriage is divided into more than one OFDM symbol class, the time difference that the sub-district, current place that reports according to travelling carriage and the OFDM symbol of adjacent switching cell arrive, the OFDM symbol class of determining and notifying travelling carriage current area and adjacent switching cell to switch usefulness, and the idle sub-carrier in the OFDM symbol class of travelling carriage current area and adjacent switching cell switching usefulness;
Further comprise between step b and the step c: travelling carriage will with idle sub-carrier in being transformed in the current area OFDM symbol class that switches usefulness being connected of current area on;
The described travelling carriage of step c utilizes the described adjacent switching cell of described idle sub-carrier and step b to set up link-attached process: travelling carriage utilizes in the described adjacent switching cell idle sub-carrier in the OFDM symbol class that switches usefulness to set up link with adjacent switching cell to be connected.
4. method according to claim 3 is characterized in that, the OFDM symbol class that described current area and adjacent switching cell switch usefulness is: the nonoverlapping OFDM symbol class of time that arrives travelling carriage in current area and the adjacent switching cell.
5. method according to claim 4, it is characterized in that, this method further comprises: moving table measuring arrives time difference of nonoverlapping OFDM symbol class of time of travelling carriage less than predefined time difference during threshold value in current area and adjacent switching cell, informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness; The time difference that the network side joint reports according to travelling carriage and the subcarrier information of the current use of travelling carriage redefine the idle sub-carrier in the OFDM symbol class that current area and adjacent switching cell switch usefulness, re-execute subsequent step then.
6. method according to claim 3 is characterized in that, described definite current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the method for the idle sub-carrier in the OFDM symbol class of this switching usefulness may further comprise the steps:
01) checks the subcarrier that whether has enough free time in every class OFDM symbol in current area and the adjacent switching cell successively, be used for transmitting the data that this current to be switched travelling carriage transmits on current area and adjacent switching cell residue OFDM class, if, then directly obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 02);
02) metrical information that reports according to other travelling carriages except that this current to be switched travelling carriage in current area and the adjacent switching cell, judge whether exist other need stride the travelling carriage that switch the sub-district in current area and the adjacent switching cell, if, then execution in step 03), otherwise execution in step 04);
03) according to current to be switched travelling carriage and step 02) described other need enter the number of the shared subcarrier of the travelling carriage of switching state, in current area and adjacent switching cell, can judge successively in every class OFDM symbol with step 02) the described subcarrier that other need enter residue OFDM class in the shared sub-district of the shared subcarrier of the travelling carriage of switching state and current to be switched travelling carriage exchanges, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in the sub-district, if can, then carrying out subcarrier exchanges, obtain the idle sub-carrier in such OFDM symbol, process ends, otherwise execution in step 04);
04) according to current to be switched travelling carriage and the needs number that enters the shared subcarrier of the travelling carriage of switching state not, in current area and adjacent switching cell, judge successively in every class OFDM symbol can the travelling carriage that does not need to enter switching state is shared subcarrier and the shared subcarrier of current to be switched travelling carriage exchange, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then carrying out subcarrier diverts, obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 05);
05) checks and calculates the number of the shared subcarrier of the above-mentioned travelling carriage that can exchange and divert, reduce the data rate of these travelling carriages, already present idle sub-carrier in the subcarrier that can exchange and divert in a certain OFDM symbol class and this OFDM symbol class is distributed to current to be switched travelling carriage, process ends.
7. method according to claim 6 is characterized in that, this method further comprises: network side writes down in acquired every class OFDM symbol and to distribute the remaining idle sub-carrier in back, to reduce the search operation in other travelling carriage switching flows next time.
8. method according to claim 1 is characterized in that, the described release of steps d is connected with link between the sub-district that can not satisfy communicating requirement, and the process of recovering normal communication mode is:
By network side according to the reporting information of travelling carriage indication travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected, perhaps by travelling carriage according to self detected information discharge with the sub-district that can not satisfy communicating requirement between link be connected and informing network side;
Network side detects that travelling carriage is current to have only a link, and this travelling carriage is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
9. method according to claim 1 is characterized in that, described adjacent switching cell is one or more neighbor cells.
10. realize striding the method for sub-district soft handover in the ofdm system, it is characterized in that, network side is divided into the OFDM symbol class with the orthogonal frequency division multiplex OFDM symbol of sub-district, described travelling carriage place, with the subcarrier at least one OFDM symbol class wherein as the idle sub-carrier of not transmitting described travelling carriage current area business datum; This method may further comprise the steps:
A, travelling carriage utilize described idle sub-carrier to measure the signal quality of current area and neighbor cell in real time, and report measurement information;
B, network side confirm that according to the reporting information of travelling carriage these travelling carriage needs stride the sub-district and switch, and after determining adjacent switching cell, the notice travelling carriage enters strides the sub-district switch mode;
C, travelling carriage utilize the described adjacent switching cell of described idle sub-carrier and step b to set up link to be connected, to receive the signal of sub-district, current place and adjacent switching cell simultaneously, and merge;
D, travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected the recovery normal communication mode.
11. method according to claim 10 is characterized in that,
The described metrical information of step a comprises: the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, the time difference that the orthogonal frequency division multiplex OFDM symbol of travelling carriage sub-district, current place and each neighbor cell arrives;
The described network side of step b is confirmed this travelling carriage according to the pilot signal strength of travelling carriage sub-district, current place and neighbor cell, and whether needs are striden the sub-district switching.
12. method according to claim 11 is characterized in that,
The described network side notice of step b travelling carriage enters the process of striding the sub-district switch mode and is: the OFDM symbol of the adjacent switching cell that network side will be selected is divided into more than one OFDM symbol class respectively, the time difference that the sub-district, current place that reports according to travelling carriage and the OFDM symbol of adjacent switching cell arrive, the OFDM symbol class of determining and notifying travelling carriage current area and adjacent switching cell to switch usefulness, and the idle sub-carrier in the OFDM symbol class of travelling carriage current area and adjacent switching cell switching usefulness;
Further comprise between step b and the step c: when travelling carriage keeps striding cell measurement and the connection mode of current area;
The described travelling carriage of step c utilizes described idle sub-carrier and the described adjacent switching cell of step b to set up link-attached process: travelling carriage utilizes the idle sub-carrier in the OFDM symbol class that switches usefulness in the described adjacent switching cell, sets up link with adjacent switching cell and is connected.
13. method according to claim 12 is characterized in that, the OFDM symbol class that described current area and adjacent switching cell switch usefulness is: the nonoverlapping OFDM symbol class of time that arrives travelling carriage in current area and the adjacent switching cell.
14. method according to claim 13, it is characterized in that, this method further comprises: moving table measuring arrives time difference of nonoverlapping OFDM symbol class of time of travelling carriage less than predefined time difference during threshold value in current area and adjacent switching cell, informing network stresses newly to determine that current area and adjacent switching cell switch the OFDM symbol class of usefulness; The time difference that the network side joint reports according to travelling carriage and the subcarrier information of the current use of travelling carriage redefine the idle sub-carrier in the OFDM symbol class that current area and adjacent switching cell switch usefulness, re-execute subsequent step then.
15. method according to claim 12 is characterized in that, described definite current area and adjacent switching cell switch the OFDM symbol class of usefulness, and the method for the idle sub-carrier in the OFDM symbol class of this switching usefulness may further comprise the steps:
01) checks the subcarrier that whether has enough free time in every class OFDM symbol in current area and the adjacent switching cell successively, be used for transmitting the data that this current to be switched travelling carriage transmits on current area and adjacent switching cell residue OFDM class, if, then directly obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 02);
02) metrical information that reports according to other travelling carriages except that this current to be switched travelling carriage in current area and the adjacent switching cell, judge whether exist other need stride the travelling carriage that switch the sub-district in current area and the adjacent switching cell, if, then execution in step 03), otherwise execution in step 04);
03) according to current to be switched travelling carriage and step 02) described other need enter the number of the shared subcarrier of the travelling carriage of switching state, in current area and adjacent switching cell, can judge successively in every class OFDM symbol with step 02) the described subcarrier that other need enter residue OFDM class in the shared sub-district of the shared subcarrier of the travelling carriage of switching state and current to be switched travelling carriage exchanges, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in the sub-district, if can, then carrying out subcarrier exchanges, obtain the idle sub-carrier in such OFDM symbol, process ends, otherwise execution in step 04);
04) according to current to be switched travelling carriage and the needs number that enters the shared subcarrier of the travelling carriage of switching state not, in current area and adjacent switching cell, judge successively in every class OFDM symbol can the travelling carriage that does not need to enter switching state is shared subcarrier and the shared subcarrier of current to be switched travelling carriage exchange, so that current to be switched travelling carriage obtains enough idle sub-carrier on this OFDM symbol class, be used for transmitting this current to be switched travelling carriage and remain the data of transmitting on other the OFDM class in current area and adjacent switching cell, if can, then carrying out subcarrier diverts, obtain the idle sub-carrier in such OFDM symbol, otherwise execution in step 05);
05) checks and calculates the number of the shared subcarrier of the above-mentioned travelling carriage that can exchange and divert, reduce the data rate of these travelling carriages, already present idle sub-carrier in the subcarrier that can exchange and divert in a certain OFDM symbol class and this OFDM symbol class is distributed to current to be switched travelling carriage, process ends.
16. method according to claim 15 is characterized in that, this method further comprises: network side writes down in acquired every class OFDM symbol and to distribute the remaining idle sub-carrier in back, to reduce the search operation in other travelling carriage switching flows next time.
17. method according to claim 10 is characterized in that, the described release of steps d is connected with link between the sub-district that can not satisfy communicating requirement, and the process of recovering normal communication mode is:
By network side according to the reporting information of travelling carriage indication travelling carriage discharge with the sub-district that can not satisfy communicating requirement between link be connected, perhaps by travelling carriage according to self detected information discharge with the sub-district that can not satisfy communicating requirement between link be connected and informing network side;
Network side detects that travelling carriage is current to have only a link, and this travelling carriage is in when striding the sub-district switch mode, indicates this travelling carriage to return to normal communication mode.
18. method according to claim 10 is characterized in that, described adjacent switching cell is one or more neighbor cells.
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| CN101663912A (en) * | 2007-03-12 | 2010-03-03 | 诺基亚公司 | Techniques for reporting and simultaneous transmission mechanism to improve reliability of signaling |
| CN101686472B (en) * | 2008-09-28 | 2013-04-17 | 华为技术有限公司 | Method and device for reporting measurement |
| CN104247491A (en) * | 2013-02-01 | 2014-12-24 | 华为技术有限公司 | Radio link control method and apparatus, radio network controller and user equipment |
| CN104378777B (en) * | 2013-08-13 | 2020-12-22 | 索尼公司 | User equipment, base station equipment, communication equipment and method in wireless communication system |
| CN103517364B (en) * | 2013-10-08 | 2016-09-28 | 中国联合网络通信集团有限公司 | Micro-base station macrocell changing method, micro-base station and equipment of the core network |
| CN108076496B (en) * | 2016-11-16 | 2022-06-28 | 北京新岸线移动多媒体技术有限公司 | Method, system and device for realizing cross-cell switching in wireless network |
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